package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")//从yml文件读取配置
    private String basePath;

    /*file.getSize(),获取文件大小(字节码数B)*/

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());
        //原始文件名.jpg
        String suffix = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));


        //使用UUID重新生成文件名,防止文件名称重复造成文件覆
        String fileName = UUID.randomUUID().toString() + suffix;
        //创建一个目录对象
        File dir = new File(basePath);

        //判断当前目录是否存在
        if (!dir.exists()){
            dir.mkdirs();
        }
        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath+fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);
    }


    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
//    public void download(String name, HttpServletResponse response){
//        try {
//            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
//
//            ServletOutputStream outputStream = response.getOutputStream();
//            response.setContentType("image/jpeg");
//
//            int len=0;
//            byte[]bytes=new byte[1024];
//            while ((len=fileInputStream.read(bytes))!=-1){
//                outputStream.write(bytes,0,len);
//                outputStream.flush();
//            }
//            outputStream.close();
//            fileInputStream.close();
//
//        } catch (Exception e) {
//            e.printStackTrace();
//        }
//    }


    public void download(String name,HttpServletResponse response){
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            IOUtils.copy(fileInputStream,response.getOutputStream());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
